4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/config.h>
8 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/file.h>
12 #include <linux/smp_lock.h>
13 #include <linux/highuid.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.h>
19 #include <asm/uaccess.h>
20 #include <asm/unistd.h>
22 void generic_fillattr(struct inode *inode, struct kstat *stat)
24 stat->dev = inode->i_sb->s_dev;
25 stat->ino = inode->i_ino;
26 stat->mode = inode->i_mode;
27 stat->nlink = inode->i_nlink;
28 stat->uid = inode->i_uid;
29 stat->gid = inode->i_gid;
30 stat->xid = inode->i_xid;
31 stat->rdev = inode->i_rdev;
32 stat->atime = inode->i_atime;
33 stat->mtime = inode->i_mtime;
34 stat->ctime = inode->i_ctime;
35 stat->size = i_size_read(inode);
36 stat->blocks = inode->i_blocks;
37 stat->blksize = inode->i_blksize;
40 EXPORT_SYMBOL(generic_fillattr);
42 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
44 struct inode *inode = dentry->d_inode;
47 retval = security_inode_getattr(mnt, dentry);
51 if (inode->i_op->getattr)
52 return inode->i_op->getattr(mnt, dentry, stat);
54 generic_fillattr(inode, stat);
56 struct super_block *s = inode->i_sb;
58 blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
59 stat->blocks = (s->s_blocksize / 512) * blocks;
60 stat->blksize = s->s_blocksize;
65 EXPORT_SYMBOL(vfs_getattr);
67 int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
72 error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
74 error = vfs_getattr(nd.mnt, nd.dentry, stat);
80 int vfs_stat(char __user *name, struct kstat *stat)
82 return vfs_stat_fd(AT_FDCWD, name, stat);
85 EXPORT_SYMBOL(vfs_stat);
87 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
92 error = __user_walk_fd(dfd, name, 0, &nd);
94 error = vfs_getattr(nd.mnt, nd.dentry, stat);
100 int vfs_lstat(char __user *name, struct kstat *stat)
102 return vfs_lstat_fd(AT_FDCWD, name, stat);
105 EXPORT_SYMBOL(vfs_lstat);
107 int vfs_fstat(unsigned int fd, struct kstat *stat)
109 struct file *f = fget(fd);
113 error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
119 EXPORT_SYMBOL(vfs_fstat);
121 #ifdef __ARCH_WANT_OLD_STAT
124 * For backward compatibility? Maybe this should be moved
125 * into arch/i386 instead?
127 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
129 static int warncount = 5;
130 struct __old_kernel_stat tmp;
134 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
136 } else if (warncount < 0) {
137 /* it's laughable, but... */
141 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
142 tmp.st_dev = old_encode_dev(stat->dev);
143 tmp.st_ino = stat->ino;
144 tmp.st_mode = stat->mode;
145 tmp.st_nlink = stat->nlink;
146 if (tmp.st_nlink != stat->nlink)
148 SET_UID(tmp.st_uid, stat->uid);
149 SET_GID(tmp.st_gid, stat->gid);
150 tmp.st_rdev = old_encode_dev(stat->rdev);
151 #if BITS_PER_LONG == 32
152 if (stat->size > MAX_NON_LFS)
155 tmp.st_size = stat->size;
156 tmp.st_atime = stat->atime.tv_sec;
157 tmp.st_mtime = stat->mtime.tv_sec;
158 tmp.st_ctime = stat->ctime.tv_sec;
159 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
162 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
165 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
168 error = cp_old_stat(&stat, statbuf);
172 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
175 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
178 error = cp_old_stat(&stat, statbuf);
182 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
185 int error = vfs_fstat(fd, &stat);
188 error = cp_old_stat(&stat, statbuf);
193 #endif /* __ARCH_WANT_OLD_STAT */
195 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
199 #if BITS_PER_LONG == 32
200 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
203 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
207 memset(&tmp, 0, sizeof(tmp));
208 #if BITS_PER_LONG == 32
209 tmp.st_dev = old_encode_dev(stat->dev);
211 tmp.st_dev = new_encode_dev(stat->dev);
213 tmp.st_ino = stat->ino;
214 tmp.st_mode = stat->mode;
215 tmp.st_nlink = stat->nlink;
216 if (tmp.st_nlink != stat->nlink)
218 SET_UID(tmp.st_uid, stat->uid);
219 SET_GID(tmp.st_gid, stat->gid);
220 #if BITS_PER_LONG == 32
221 tmp.st_rdev = old_encode_dev(stat->rdev);
223 tmp.st_rdev = new_encode_dev(stat->rdev);
225 #if BITS_PER_LONG == 32
226 if (stat->size > MAX_NON_LFS)
229 tmp.st_size = stat->size;
230 tmp.st_atime = stat->atime.tv_sec;
231 tmp.st_mtime = stat->mtime.tv_sec;
232 tmp.st_ctime = stat->ctime.tv_sec;
233 #ifdef STAT_HAVE_NSEC
234 tmp.st_atime_nsec = stat->atime.tv_nsec;
235 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
236 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
238 tmp.st_blocks = stat->blocks;
239 tmp.st_blksize = stat->blksize;
240 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
243 asmlinkage long sys_newstat(char __user *filename, struct stat __user *statbuf)
246 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
249 error = cp_new_stat(&stat, statbuf);
254 asmlinkage long sys_newlstat(char __user *filename, struct stat __user *statbuf)
257 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
260 error = cp_new_stat(&stat, statbuf);
265 #ifndef __ARCH_WANT_STAT64
266 asmlinkage long sys_newfstatat(int dfd, char __user *filename,
267 struct stat __user *statbuf, int flag)
272 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
275 if (flag & AT_SYMLINK_NOFOLLOW)
276 error = vfs_lstat_fd(dfd, filename, &stat);
278 error = vfs_stat_fd(dfd, filename, &stat);
281 error = cp_new_stat(&stat, statbuf);
288 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
291 int error = vfs_fstat(fd, &stat);
294 error = cp_new_stat(&stat, statbuf);
299 asmlinkage long sys_readlinkat(int dfd, const char __user *path,
300 char __user *buf, int bufsiz)
308 error = __user_walk_fd(dfd, path, 0, &nd);
310 struct inode * inode = nd.dentry->d_inode;
313 if (inode->i_op && inode->i_op->readlink) {
314 error = security_inode_readlink(nd.dentry);
316 touch_atime(nd.mnt, nd.dentry);
317 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
325 asmlinkage long sys_readlink(const char __user *path, char __user *buf,
328 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
332 /* ---------- LFS-64 ----------- */
333 #ifdef __ARCH_WANT_STAT64
335 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
339 memset(&tmp, 0, sizeof(struct stat64));
341 /* mips has weird padding, so we don't get 64 bits there */
342 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
344 tmp.st_dev = new_encode_dev(stat->dev);
345 tmp.st_rdev = new_encode_dev(stat->rdev);
347 tmp.st_dev = huge_encode_dev(stat->dev);
348 tmp.st_rdev = huge_encode_dev(stat->rdev);
350 tmp.st_ino = stat->ino;
351 #ifdef STAT64_HAS_BROKEN_ST_INO
352 tmp.__st_ino = stat->ino;
354 tmp.st_mode = stat->mode;
355 tmp.st_nlink = stat->nlink;
356 tmp.st_uid = stat->uid;
357 tmp.st_gid = stat->gid;
358 tmp.st_atime = stat->atime.tv_sec;
359 tmp.st_atime_nsec = stat->atime.tv_nsec;
360 tmp.st_mtime = stat->mtime.tv_sec;
361 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
362 tmp.st_ctime = stat->ctime.tv_sec;
363 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
364 tmp.st_size = stat->size;
365 tmp.st_blocks = stat->blocks;
366 tmp.st_blksize = stat->blksize;
367 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
370 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
373 int error = vfs_stat(filename, &stat);
376 error = cp_new_stat64(&stat, statbuf);
380 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
383 int error = vfs_lstat(filename, &stat);
386 error = cp_new_stat64(&stat, statbuf);
390 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
393 int error = vfs_fstat(fd, &stat);
396 error = cp_new_stat64(&stat, statbuf);
401 asmlinkage long sys_fstatat64(int dfd, char __user *filename,
402 struct stat64 __user *statbuf, int flag)
407 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
410 if (flag & AT_SYMLINK_NOFOLLOW)
411 error = vfs_lstat_fd(dfd, filename, &stat);
413 error = vfs_stat_fd(dfd, filename, &stat);
416 error = cp_new_stat64(&stat, statbuf);
421 #endif /* __ARCH_WANT_STAT64 */
423 void inode_add_bytes(struct inode *inode, loff_t bytes)
425 spin_lock(&inode->i_lock);
426 inode->i_blocks += bytes >> 9;
428 inode->i_bytes += bytes;
429 if (inode->i_bytes >= 512) {
431 inode->i_bytes -= 512;
433 spin_unlock(&inode->i_lock);
436 EXPORT_SYMBOL(inode_add_bytes);
438 void inode_sub_bytes(struct inode *inode, loff_t bytes)
440 spin_lock(&inode->i_lock);
441 inode->i_blocks -= bytes >> 9;
443 if (inode->i_bytes < bytes) {
445 inode->i_bytes += 512;
447 inode->i_bytes -= bytes;
448 spin_unlock(&inode->i_lock);
451 EXPORT_SYMBOL(inode_sub_bytes);
453 loff_t inode_get_bytes(struct inode *inode)
457 spin_lock(&inode->i_lock);
458 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
459 spin_unlock(&inode->i_lock);
463 EXPORT_SYMBOL(inode_get_bytes);
465 void inode_set_bytes(struct inode *inode, loff_t bytes)
467 /* Caller is here responsible for sufficient locking
468 * (ie. inode->i_lock) */
469 inode->i_blocks = bytes >> 9;
470 inode->i_bytes = bytes & 511;
473 EXPORT_SYMBOL(inode_set_bytes);